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M. C. SCHWEINEHT AND H. P. KRAFT.

PRESSURE GAGE.

APPLICATION 11151) 1111111.21, 19111.

Patented A110. 5, 1919..

INVE NTOR www U01/nays, i

WITNESSES:

vUNITED STATES PATENT MAXIMILIAN CHARLES SCHWEINERT, OF WEST HOBOKEN, AND HENRY P. KRAFT, 0F RIDGEWOOD, NEW JERSEY.

PRESSURE-GAGE.

Specification of Letters Patent.

Patented Aug. 5, 1919.

Original application led June 16, 19111, Seri-a1 No. 633,598. Divided and this application filed March 21,

g 1916. Serial No. 85,624.

To all whom t may concern.' l Be it known that we, MAXIMILIAN CHARLES SCHWEINERT, of West Hoboken, in the county of Hudson and State of New Jersey, and HENRY P. KRAFT, of Ridgewood, in the county of Bergen and State of New Jersey, both citizens of the United States of America, have invented certain new and useful Improvements in Pressure-Gages, of which the following is a specification. 1

This invention relates to pressure gages, and aims to provide certain improvements therein. The invention is particularly applicable to pressure gages for use in connection with pneumatic tires. The object of the invention is to provide an attachment to a registering gage, whereby the register ing feature may be temporarily suspended. The invention is particularly useful for a pressure gage adapted to be used in connection with tire inflating means including a pump or tank, although it is not limitedl in its application to such use.

The present invention is a division of our former application for patent, Serial No. 633,598, sied June 1e, 1911.

In the drawings accompanying this application we have illustrated the said invention as applied to a registering gage and used with a pump connection. In the said drawings,- v

Figure 1 is a side elevation partly in vertical section showing the invention as ap,-

plied to a registering gage, together with a form of connection suitable for usey in connection with pumps or inflating tanks.

`,Fig. 2 isan enlarged vertical section'of Fig. 3 is a plan of the top of the gage shown in Figs. 1 and 2 illustrating our invention.

The gage B is preferably of a construction illustrated in several applications heretofore filed by Maximilian C. Schweinert and Henry P. Kraft. The pressure responsive member of the gage preferably comprises a' rubber tube n closed at its outer end, a Aplunger o against which the end of the tube n bears, and a spring p connected to the plunger 'o and the bottom ofthe casing so that the pressure in the tube a raises the plunger against the tension of the spring. The gage is also provided wlth' a sleeve g sleeve so that the sleeve remains in the outermost position to which it is forced by the plunger by friction, the plunger retiring lili when the pressure is relieved. A friction ring 7' is usually provided to hold the sleeve more positively in its positions.

When the gage B is used with a connection of the type illustrated to which is joined a pump or tank the influx of air is apt to raise the plunger o of the gage to a point beyond the proper normal pressure. In order that the sleeve q or other in dicating member may return with the plunger and finally reach the proper pressure, means are provided to connect the plunger with the indicating member, and such means which form the present invention are best shown in Figs. 2 and 3. These means comprise preferably a catch k1 which is shown as pivoted at Z1 to the top part of the sleeve g. The catch is designed to engage a stud m1 or other suitable member carried upon the plunger o. As shown the stud is fixed to the upper part of the plunger and is provided with a neck nl into which the catch k1 fits. Normally the stud fm1 upon the expansion of the tube n will engage the sleeve g and'carry the same to the extreme limit of movement of the said tube where the sleeve will be retained by the friction ring 7", and upon a reduction in pressure the tube 'will shrink and the plunger' o will be car ried in with it, the stud m1 in that case passing freely through an opening Q1 in the top of the sleeve. At this time the catch k1 will be in the dotted line position shown in Fig. 3. When it is desired however, that the indicator g shall return, the catch 701 may be thrown to the full line position of Fig. 3 locking the plunger 0 and the sleeve together so that the indicating sleeve g will `riotremain in extended position.

The invention is illustrated as employed connection with .a pressureggage of a The invention 1s particularly useful when the pressure gage to which it is attached is 'its exterior and interior surfaces.

used with a pump connection by reason of the fact already stated. Accordingly, we have illustrated the invention as so employed. A brief description of these parts in connection with which our invention is illustrated is as follows: The connection as a whole is designated A and to this is attachedthe gage B and coupling C for connection to a tire valve or the like.

The connection A preferably consists of a member having three branches a, and c, all of which are tubular and designed to carry air under pressure. One of the branches a is adapted to be connected with a tube or hose leading from the pump or tank. It is preferably provided with a check valve d designed toprevent back pressure from ythey tire to the pump or tank.

, The branch b is adapted for connection to the gage B. For this purpose it is provided with an enlarged collar or flange e, screwthreaded.- on its outer face and having an exterior diameter enlarged to receive a coupling f engaging a flange g on the lower part of the gage B. Beyond the flange e the `branch b is provided with an upwardly eX- tending nipple k which is screw-threaded on ple li is of approximately the same diameter as theend of the tire valve, and is adapted to fit ina lower o enino z' of the gage and contact with a pac ring c of the latter when the couplin is tightened on the flange e.

' Within tie extension b and preferably near the end of the nipple It is located a 'checkfvalve Z, the defiating pin m of which is arranged in such relation to the end of the nipple. that it is engaged by the deflator m2 of the gage, thus permitting air within the branch b to pass upwardly into the gage.

The coupling C is constructed so that it i may be quickly and easily attached to and detached from a tire valve or the like. To this end the branch c is provided with an enlarged outer portion s, the inner end of whichis formed with a shoulder t. Surrounding the portion s and swiveled thereto is a split tubular member u having at its inner end a flange c engaging the shoulder i, which flange is turned down into place after the parts are united. The member u is formed with a series of slots w preferably extending from the outer end of the tubular member to a point near the flange o, so as to provide in effect a series of spring arms which preferably normally have a tendency to spring outward. Each of the arms is provided at its outer end with a screw threaded portion a designed to engage the exterior screw-thread of a tire valve. Surrounding the member u is a sliding collar b which is preferably formed on its inner side with a series of projections c designed to enter into the slots fw. When the sliding collar 7) is pushed inwardly the spring arms The nip-v are free to move outwardly to such an extent that their screw-threaded portions will pass over the screw-threaded exterior of the valve shell, so that the latter may enter in between the arms. lVhen the collar is pushed outwardly toward the end of the member u the diameter of the effective opening in the outer end of the member u is so reduced that the threads of the latter engage the threads of the valve'shell. By rotating the collar b (and with it the member u) a short distance a firm connection is made with the valve shell. The enlarged end s of the branch c is provided with a packing washer (Z which is designed to contact with the outer end of the valve shell to make a leak-tight joint between the parts. The enlarged portion s is formed with an annular recess adapted to receive the washer. The portion s is also I Such means are shown as comprising a tubular nipple f" formed integrally upon the portion S and boredpto near its outer end, where it is provided with a projection g adapted to contact with the deflating pin e. The nipple is provided with a passage or passages h through which the air can reach the bore of the branch c. By this construction the piunp connection may be very quickly and firmly attached to the tire valve with a leak-tight joint. I The packing is carried upon a fixed part, and the deflator is also fixed to and preferably forms a part of the branch c whereby simplicity and economy are obtained.

` The connection A is illustrated as havin a branch?)V which is angularly arranged wit relation toA the branch a so that the gage may be brought outside of the plane of the wheel. In the usual size -of automobile wheel there is usually not room to accommo- `sions than would sometimes otherwise be possible.

-datethe gage between the spokes of the The construction of the connectionillus- I trated is not claimed herein as the same forms part of the invention claimed in the application of which: this is a division, nor is the construction of the gage claimed herein.

The invention is shown as applied to a gage of a particular type used with a con nection especially adapted to indicate pressure in ai tire inflating device, and accordingly it is illustrated as having a branchfor connection to a tire and another branch for connection to a pump or compressed air tank. The invention however is not so limited but may within the limits of the appended claims be used in connection with another type of gage, or it may be attached to the gage irrespective of the employment -tion of Maximilian Charles Schweinert, Se-

rial No. 631,059, led June 3, 1911.

What We claim is:-

1. In a device of the character described, a gage having a part responsive to variations of pneumatic pressure, lan indicating member normally disconnected therefrom, and

means for connecting said indicating member to said part, said means comprising a catch device.

2. In a device of the `character described, a gage having a part responsive to variations of pneumatic pressure, an indicating member normally disconnected therefrom, and means for connecting said indicating member to said part, said means comprising a pivoted catch device. 3. In a device of the character described, a gage having a part responsive to variations of pneumatic pressure, an indicating member normally disconnected therefrom, and

means for connecting said indicating member to said part, said means comprising a stud carried by said part, and a catch device carried by said indicating member.

4. In a gage of the character described, a member responsive to variations of static pneumatic pressure, an indicating member actuated thereby, said pressure-responsive member and indicating member being adapted to maintain a fixed relative position during indicating movements of the gage, and a quickly actuated means Jfor connecting said indicating and pressure-responsive members and disconnecting the same, said connecting means acting invariably to connect said members only in said fixed relative position,

whereby, vwhen connected, the indicatingy member is always in lproper indicating relation to the pressure-responsive member. v

' 5. In a gage of the character described, a pneumatically movable part, an indicating member actuated thereby, and a catch device operable by the user to connect or-disconnect said indicating member and said pneumati-` cally movable part.

In. witness whereof, we have hereunto signed our names in the presence of two subscribing Witnesses. l v

MAXIMILIAN CHARLES SCHWEINERT. HENRY P. KRAFT. Witnesses E. V. MYERS, T. F. WALLACE. 

